RoadWeaver generates lane-level HD maps from scratch in seconds
RoadWeaver cuts endpoint error by 94.4% while building complete HD maps in under 3.5 seconds.
Autonomous driving simulation has long struggled with scalable, diverse HD maps. Existing approaches rely on handcrafted or reconstructed real-world maps, which don't scale, or generate only local road structures instead of complete lane-level maps. RoadWeaver, a new framework from a team of researchers led by Yueyuan Li, tackles this by synthesizing entire HD maps from scratch. It operates in a coarse-to-fine pipeline: first generating a global road layout, then expanding it into a fully connected road network, and finally constructing lane-level geometry with topologically consistent lane connectivity. This design allows simulators to evaluate autonomous driving systems over long horizons across complex, varied road networks without manual map authoring.
Benchmarks show RoadWeaver significantly outperforms state-of-the-art generation methods. It achieves a 99.8% road reachability rate, a 10.7% dead-end ratio, and an endpoint alignment error of just 0.24 meters—a 94.4% reduction compared to existing approaches. Generation speed ranges from 1.39 to 3.50 seconds per map, making it practical for large-scale simulation pipelines. The resulting maps can be directly deployed in driving simulators, enabling closed-loop evaluation of autonomous driving systems at scale. Training code and an out-of-the-box implementation will be released upon paper acceptance, which should accelerate adoption in both academic and industry research.
- RoadWeaver generates complete lane-level HD maps from scratch using a coarse-to-fine framework, eliminating the need for handcrafted or reconstructed real-world maps.
- Achieves 99.8% reachability and reduces endpoint alignment error to 0.24m—94.4% lower than state-of-the-art methods—while keeping dead-end ratio at 10.7%.
- Generates full HD maps in just 1.39–3.50 seconds and can be directly deployed in driving simulators for closed-loop evaluation.
Why It Matters
RoadWeaver makes scalable, on-demand HD map generation practical, unlocking realistic long-horizon simulation for autonomous vehicle testing at low cost.